Java，IllegalAccessorError:超类访问检查失败 [英] Java, IllegalAccessorError: superclass access check failed

问题描述

我一直在用Java开发自己的一个小项目，最近，我对其进行了编译并收到此错误:

I've been working on a little project of my own in Java, and recently, I compiled it and received this error:

线程"main"中的异常java.lang.IllegalAccessError:超类访问检查失败:类kröw.zeale.v1.program.core.DataManager$ ConstructList(在未命名模块@ 0x4563e9ab中)无法访问类com.sun.javafx. collections.ObservableListWrapper(在javafx.base模块中)，因为模块javafx.base不会将com.sun.javafx.collections导出到未命名的模块@ 0x4563e9ab

Exception in thread "main" java.lang.IllegalAccessError: superclass access check failed: class kröw.zeale.v1.program.core.DataManager$ConstructList (in unnamed module @0x4563e9ab) cannot access class com.sun.javafx.collections.ObservableListWrapper (in module javafx.base) because module javafx.base does not export com.sun.javafx.collections to unnamed module @0x4563e9ab

背景:

因此，我目前有三个不同的类，它们都在同一个程序包中.我的层次结构如下:

Background:

So, I currently have three different classes, all in the same package. My hierarchy is as follows:

• Kröw
• DataManager
   ♦ ConstructList

在我程序的早期版本中，我的层次结构是这样的:

In previous versions of my program, my hierarchy was like this:

• Kröw
   ♦ DataManager
      - ConstructList

在两种情况下，ConstructList都扩展了com.sun.javafx.collections.ObservableListWrapper<Construct>. (我认为这里的Construct类不是必需的，我不想显示它，但是如果需要的话，我可以显示.)

In both cases, ConstructList extended com.sun.javafx.collections.ObservableListWrapper<Construct>. (I don't think that the class Construct is necessary here and I'd rather not show it, but I can if needed.)

无论如何，现在，我的IDE可以按预期运行该应用程序，但是，当我导出该应用程序时，上面的异常给了我.

Anyways, right now, my IDE can run the application as expected, however, when I export it, the above exception is given to me.

完整堆栈跟踪:

Exception in thread "main" java.lang.IllegalAccessError: superclass access check failed: class kröw.zeale.v1.program.core.DataManager$ConstructList (in unnamed module @0x4563e9ab) cannot access class com.sun.javafx.collections.ObservableListWrapper (in module javafx.base) because module javafx.base does not export com.sun.javafx.collections to unnamed module @0x4563e9ab
        at java.base/java.lang.ClassLoader.defineClass1(Native Method)
        at java.base/java.lang.ClassLoader.defineClass(Unknown Source)
        at java.base/java.security.SecureClassLoader.defineClass(Unknown Source)
        at java.base/jdk.internal.loader.BuiltinClassLoader.defineClass(Unknown Source)
        at java.base/jdk.internal.loader.BuiltinClassLoader.findClassOnClassPathOrNull(Unknown Source)
        at java.base/jdk.internal.loader.BuiltinClassLoader.loadClassOrNull(Unknown Source)
        at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(Unknown Source)
        at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(Unknown Source)
        at java.base/java.lang.ClassLoader.loadClass(Unknown Source)
        at kröw.zeale.v1.program.core.DataManager.<init>(DataManager.java:22)
        at kröw.zeale.v1.program.core.DataManager.getDataManager(DataManager.java:63)
        at kröw.zeale.v1.program.core.Kröw.<clinit>(Kröw.java:23)

错误中提到的类Kröw的一部分:

Part of class Kröw that is mentioned in the error:

private static final DataManager DATA_MANAGER = DataManager.getDataManager(); // line 23

错误中提到的类DataManager的部分:

Parts of class DataManager that are mentioned in the error:

static DataManager getDataManager() { // line 66
    return new DataManager();
}

和

public final ConstructList constructs = new ConstructList();  // line 22

类ConstructList:

Class ConstructList:

public class ConstructList extends ObservableListWrapper<Construct> { // line 209

    private ConstructList() {
        super(new ArrayList<>()); // line 212
    }

   public LinkedList<Construct> getDeadConstructs() {
      ...
   }

   public LinkedList<Construct> getLivingConstructs() {
      ...
   }
}

现在，我已经查看了可以找到的资源，例如 IllegalAccessError SO问题

Now, I have looked at the resources that I could find, such as IllegalAccessError SO Question

(请注意这是怎么说的:尝试访问方法"而不是超类访问检查失败" )

该解决方案的公认答案是检查编译的jar文件和我的源代码之间是否有任何不同，因此我尝试了一下，发现有一些细微的差异.这是我反编译的jar文件中更改后的代码行. (使用 JD-GUI 反编译)

The accepted answer to that solution was to check if anything is different between the compiled jar file and my source code, so I tried that and found some minor differences. Here are the changed lines of code from my decompiled jar file. (Decompiled using JD-GUI)

Class DataManager:

Class DataManager:

public final ConstructList constructs = new ConstructList(null);

曾经是:

public final ConstructList constructs = new ConstructList();

类ConstructList:

Class ConstructList:

private ConstructList() {
  super();
}

曾经是:

private ConstructList() {
   super(new ArrayList<>());
}

现在，在反编译的代码中，ConstructList()构造函数没有任何参数，而且我看到它是通过传入的null来调用的，这对我来说似乎是一个错误，但我不确定是否这是我例外的原因，我无法通过互联网找到任何东西，这就是我来这里的原因.

Now, in the decompiled code, the ConstructList() constructor does not have any parameters, and I see it being invoked with null being passed in, which looks like an error to me, but I'm not sure if it is the cause of my exception and I haven't been able to find anything via the internet, which is why I came here.

另一方面，我给出的反编译代码是由我的IDE使用其导出功能创建的.我想看看构造函数中的null参数是否是问题，但我不知道如何以不同的方式编译我的代码以反映这一点.如果有人知道如何更改正在获取的导出代码，请通知我.

On another note, the decompiled code I've given was created by my IDE, using its export function. I would like to see if the null argument with my constructor is the problem, but I do not know how to compile my code in a different way to reflect that. If someone knows how I can change the exported code I am getting, please inform me.

无论如何，我想知道的是此异常是由我的代码的哪个部分引起的，以及如何解决该问题.

Anyways, what I want to know is what part of my code this exception is caused by, and how I can fix it.

推荐答案

事实证明，您正在使用Java 9进行编译，该Java利用了JDK的新module系统.通过实现模块，可能存在一种解决您的问题的有效方法，但是另一种解决方案是简单地使用Java 8进行编译！

It turns out you were compiling with Java 9 which utilizes the JDK's new module system. There is probably a valid way to fix your problem by implementing modules, however another solution is to simply compile with Java 8!

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